Well, crap. Luckily, the panicking civilians knew enough to get the hell off the ice, so she could devote her attention to dealing with this. There had to be some kind of guiding intelligence behind this, and it had to understand enough to know that the Doctor was planning to unmask, because just happening to come up for a snack right then would have been too much of a coincidence.

So at least even bothering to shout "Let him go!" while she pulled her phaser out and aimed it at the tentacle wasn't completely stupid or anything. Probably.